.content {
    height: 100%;
    width: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
}
.board {
    flex: 1;
    display: flex;
    flex-direction: row;
    overflow: hidden;
    .main {
        height: 100%;
        flex: 1;
        display: flex;
        flex-direction: column;
    }
}